Java 21 Switchover Epic

[spbolton]

This epic outlines the list of identified major tasks and epics required to migrate to the use of Java 21

Tasks

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1. Pre-J21 Update to Junit 5 with Vintage Engine, Update Mockito to latest and remove Powermock #27995
   Merged QA : Not Needed Release : 24.05.20 Team : Scout +4
2. Analyze Classes in Java 11 failing with illegal-access=deny and create add-opens parameters #28596
   Merged NW Removed Note to QA QA : Approved QA : Passed Internal Release : 24.06.19 Team : Scout +7
3. Test Java 21 and identify next steps after illegal-access workaround #28622
   QA : Not Needed Team : Scout +2
4. Update CLI to use Highest version possible between 3.5.x -> 3.6.x to support J21+J11 #28744
   Merged QA : Approved QA : Passed Internal Release : 24.07.19 Team : Scout +5
5. Task: Update Workflow to Support Any Java Version Using SDKMAN #27998
   Merged QA : Not Needed QA : Passed Internal Team : Scout +4
6. Identify any issues with Plugin development in Java 21 and strategy for Customers to update #27997
   QA : Not Needed Team : Scout +2
7. Update Project Java Version to 21.04-ms and Ensure Successful Build and Test Completion #29685
   Merged OKR : Core Features Priority : 1 Show Stopper QA : Approved QA : Passed Internal Release : 24.09.21 Team : Scout +7
8. Cleanup Java21 arguments #29756
   Merged QA : Approved QA : Passed Internal Release : 24.09.21 Team : Scout +5
9. Update to ZGC ZGenerational garbage collection supported in J21 #29759
   Merged QA : Not Needed QA : Passed Internal Release : 24.09.21 Team : Scout +5

[spbolton]

Reopened to include switchover and post switchover tasks